I'm not sure if they are present in the PC version of the game. But on the PS2 there were Forge glitches the most common being the Dark Forge Glitch. In my several playthroughs of the game I have only encountered it twice but twice out of like 7 playthroughs is still fairly common. (happened on my very first playthrough and on my 3rd)

Please make sure to save your game at every Save Obelisk you come across.

Also before coming to the Dark Forge you will come across a balcony of crows. Do your best to not scare them. Some believe that they may be what triggers the glitch.

The dark forge glitch is basically after you go through the entire Dark Forge dungeon and are trying to exit you will come across the exit door but it will be already sealed shut permantely trapping you inside. If this happens you will need to reboot the save game from right before coming to the dungeon and have to redo it. Unfortunately if it occurs there is nothing you can about it but that or I would suggest save sharing but if you load a save file to get past it from someone elses game you'll miss out on a very intriguing cutscene.

Just remember save often (unfortunately only able to at certain places) to new files if you can and don't scare off the birds as best you can.

The GoG version is already patched to 1.02 which I'm pretty sure fixes that problem

Well I wasn't sure, I've not dealt with the PC version of the game much and Eidos support for LoK series in general has been abysmal. The PS2 of course couldn't be patched or anything so you always take that risk when playing that version.

That would be nice if that was indeed fixed. Due to lack of frequent saving in SR2 it really sucks when you have to replay a whole dungeon and more due to one of those glitches.

figured it would best to offer a pre-emptive warning just in case.

Why do you think it was abysmal? I would say that it was rather good. All problems that we see today are the results of systems and hardware that was not available when the games were released. And no one patches a problem that arises four years after release.
That being said - I never encountered this bug and I've played through the game quite a few times. So either I'm lucky or it's a PS2 exclusive.

They hardly bothered at all to patch the games or help the community keep them going on newer hardware. I'm well aware that at a certain point many companies won't support it anymore. But many at least will help to some extent. Eidos was always ever interested in padding their wallets. Getting them to help at all was like pulling teeth and that was back when the games were newer. Hell I remember a conversation on their official forums where their official word was. We are looking to the future of the series not to the past. (meaning they weren't bothering with old games despite the loyal fanbase)

But their greed was the case before these games were ever released. Cutting Crystal Dynamics short and releasing the games unfinished to begin with. It worked for the best in Soul Reaver since it allowed for the amazing time warping plot line, but Soul Reaver 2 was cut majorily of gameplay content and the game (from a gameplay standpoint alone) isn't very good and that's Eidos faults for rushing the game out the door before CD was finished. The gameplay of Soul Reaver 2 is just a few hour backtracking repetitive and frustrating combat romp back and forth a damn near straight line. The jaw dropping story with the perfect storyline placement pacing is what makes the game worth playing.

The forge gltiches are infamous in the PS2 version to boot making for an even more frustrating experience.

I can't speak of their practices and quality now since it's actually a part of Squeenix now and Crystal Dynamics is pretty much a completely different company than it was back then. (so much crew changes) But I've never been a fan of Eidos. I've only ever been a fan of Legacy of Kain lore which was a Silicon Knights creation not CD or Eidos and Amy Hennings storytelling.

I guess we'll just have to agree to disagree here. I'm not saying that support was very good, but it was pretty standard. Definitely not below average from my perspective.
A good example here is BO2. Version 1.00 had graphic problems with fog (most noticeable in Eternal Prison), mouse control problems (it was trying to emulate a gamepad instead of acting like typical PC camera) and is rather unstable with random crashes.
Patch 1.02 fixes all of these issues.

If you want an example of bad support look at Ubisoft. PoP:WW is a great but extremely buggy game. What was Ubisoft's answer?
Don't worry. We are working on a patch.
We are still working on a patch.
The patch is coming. Any day now.

One year later:
You remember that patch that we were talking about? Well, it's not coming. Sorry. Just play the game unpatched. I would like to see that thread. I'm not saying it didn't happen, I just don't remember it.
What I do remember is a similar sentence, but it was an answer to the question about possible remakes, not support. I agree with everything you said about SR2. It's more of an interactive movie than a game. The main reason why I was willing to forgive a lot to that game was the story and the fact that I loved first one so much. I still think that at that time the biggest misstep in the series handling happened. Instead of releasing one proper sequel two unfinished ones were made. SR2 having great story and atmosphere but seriously lacking in gameplay department, and BO2 being its exact opposite.
I wouldn't put all blame on Eidos though when it comes to SR2. You have to remember that it started as a PS1 game (hard to say whose decision it was though), which was a really bad choice since it was near the end of the console's life cycle. It's hard to say how much time CD wasted by this mistake. I'll just quote Amy Hening's thoughts about how CD and Eidos feel about the series:

"Well anything I would say is complete speculation because I've been away from Crystal Dynamics for six years now, but I felt like I got to do what I wanted to do. Do I feel like I got cutoff midstream? No, I'm the one that left and joined Naughty Dog, and I knew in the middle of development on Defiance that I was going to leave and join Naughty Dog. So I was wrapping up my story. All I can tell you is that Eidos and Crystal Dynamics legitimately love that franchise. If anyone thinks it's sort of been thrown in the dustbin without any thought or care, that's not the case at all. I know they would love to revive it when the time is right and resources are there. I'm sure it's something they talk about; whether it'll ever happen I don't know."

From this interview.