Here is an old one that I don't think it ever got reported:

SpellForce 2: Demons of the Past never got Patch #1 version 2.68.5408, staying in its original 2.66.5360 version since release more than 10 years ago.

Star of Providence is missing the July 16th, 2025 update, It was said in the devs discord that there is no plan in updating on gog.

Is there even a reason of that or they just decided they don't care?

Seems weird because the game received an update in March..Maybe their answer means that the update won't come right away but instead will come at a later date?

Postal 2 on GOG doesn't technically include a Free DLC OST like Steam but there are "Music To Go POSTAL By" and "SMS Tones" as free Goodies included in the base game, so I'm suspecting they're the same thing in practice. Could anyone who owns the game on both stores confirm?

EDIT: I got confirmation that they're not the same, so the entry stays

I doubt it. Probably yet another dev that can't be bothered to update a gog version of a game people paid money for, with the typical excuse being "We don't sell enough on gog".

The DLC Her Ghost DLC for Priest Simulator: Vampire Show is now "Coming Soon" on GOG. I won't remove the entry until the actual release but it's a positive sign.

Personal opinion on the matter: while the outrage over the lack of care of games on GOG is appropriate, we should avoid cursing and "yelling" when we reach out developers/publishers. Asmodev update the game just five days after their infamous "I don't give an f what you're doing or not doing with your miserable life". The fact they did so despite receiving a rude solicitation is almost a miracle by our standards, considering that developers with resources tens of times greater than their are doing a much worse job.

That doesn't justify their reply at all of course. But considering they corrected the game shortly after, I may be willing to give the benefit of the doubt and assume they were just having a bad day.

Here are the latest news for the missing update for "Tormented Souls".
It got a bit quiet so I decided to asj Rebecca (QA for the upcomig part 2 again) and she contacted the publiahers again.
I've attached the short dialogue. It's looking good.

But a patch for Steam or also Gog? O_o

The Kindeman Remedy has had 5 updates on Steam. The version on GOG is missing features that were added in the first update nearly 2 years ago.

A note for Ixion:
The GOG version is 1.0.7.0
The Steam version is 1.0.6.5
It seems it got rolled back to a lower number because the higher number introduced a bug that stopped transporters from using the streets. So GOG didn't get the roll back and has kept the rather irritating bug.

Samudra

on GOG 1.0
on Steam 1.2

I contacted the developer and asked for an update on GOG.

Added all of them. Let's hope Samudra's developer will remedy.

↓ SpaceBourne 2 is already on the list

Well, it is not against any law being anti-consumer because consumers got close to no saying there... as funny as it sounds. Reality: Without consumers those games are done for, as it is a requirement having them.

Anyway, i want to bring up another now pretty "extended delay" which is not the first time, sadly:

SpaceBourne 2
Is still 5.2.4 on GOG and on Steam 5.3.8, very soon they will get the full release...
GOG is now about 6 months behind, which is huge.

Perhaps they got a Discord, i may try contacting them if accessible. I dunno why they can not be bothered just updating it at least every 3 months, this would already be a blast.

The True Fear: Forsaken Souls trilogy is quite a complicated case. In comparison to Steam:

Part 1 is missing Arabic, Traditional and Simplified Chinese, and Turkish. On the other hand, it seems to have European Portuguese whereas Steam has Brazilian Portuguese. Which is not a nitpick, because Part 3 indicates both on Steam and on GOG to have both variants of Portuguese as separate languages.

Part 2 is missing Traditional and Simplified Chinese.

Part 3 is missing Italian and Ukrainian.

I suspect this could be a mistake from the GOG store the way these languages are absent on GOG is too nonsensical. For example, Italian and Ukrainian are there for Part 1 and 2, yet they're suddenly missing for Part 3. Before adding those to the list, I'd like confirmation from someone who owns those games on GOG.