Well, if I could, then I could also report this as an issue on Github, but yeah, I still don't really know what exactly cause this issue. In many cases it happened when I defend from monster hit, so I initially thought maybe it's something related with hit blocking sound, but I removed all that logic (both logic for blocking sounds and hit sounds) and issue still happened randomly, so it's clearly not related with that part.
DaveTheCoder That sounds like the monster code, or other code that's executed only when the monster exists, is doing something that blocks the audio.
Maybe yes, because I actually haven't such issues (I mean, at least not reproduced it yet, but since it's random, maybe I have just more luck) when fighting with other characters (like NPCs), however monsters and NPCs are very similar and monsters are even simpler than NPCs, so not sure why monsters specifically would cause issue. It also happens for different monsters, so it doesn't seems to be related with specific audio clip too. It would be strange for me though if that would be monster code what is causing issues, because it worked fine in Godot 4.4.1 (and all previous versions I used) and code is actually pretty simple (I don't have any special effects for audio, just simple loading audio clip and calling play(), that's all in most cases).