Material not correct in packed project

In my project, i have a sea material placed onto a static plane mesh. When in Editor or PIE, the water has an ocean blue color with waves and such.
When the game is packaged the water is black but still with waves.

Another material always seem to be compiled in a packaged project, as when used first time it has blurry textures for 10-15 seconds, and then shows as it should.

We have hundreds of other materials, and they work as they should.

Any idae on what could cause thia?

Hi, I believe that the blurry materials are due to texture streaming being enabled. The missing texture occured to me once on a project, where after packaging it trees in levels were the default editor texture. Swapped out the material with a different one and it worked fine. Try making either a duplicate or child material of the one your having issues with. If that doesnt work, build the level in which the materials are used and make sure they still look good in the PIE. Hope I helped!

not the same but related problem, when the game is packaged I noticed that in the starter content materials the physical material setting is lost and reset to “none” at the next restart ,

the solution of copying the material and not using the one from the starter works,

so i tried with some other materials of the starter and the problem showed/fixed the same way, so my question is why this happens?

basically I noticed it because in the packaged game the audio for the physical material didn’t work but I reproduced the problem like this: I open the starter material and set a physical material, save , close UE and reopen, the setting has been lost. Is this a bug or is it only happening on my side? (UE 5.1.1)