Indirect Cache Fail

[epileptrolytics]

There is a problem with indirect cache rendering too bright in latest 2.6alpha.
Tested with Hall_Bench example from LuxCore example scenes, on both Mac and Windows, PathCPU and PathGPU,
while the viewport preview works alright the render is too bright:

:
Problem occurred in other scenes as well but not always.

[Dade916]

I can reproduce the problem but it is quite strange: I get the same problem with v2.5 binaries while I'm pretty sure it was working fine ... scratching my head.