Difference in interior lighting between OpenMW with legacy lighting method enabled and vanilla Morrowind

There is a difference in interior lighting between OpenMW 0.48 release with legacy lighting method enabled and vanilla Morrowind. The floor appears to be brighter and the walls are darker, which make it look unnatural. Vanilla resources of English GOG version (with Tribunal and Bloodmoon enabled) are used for both engines.

Here are the screenshots:

• OpenMW:
• Morrowind:

And the betacomment of the floor mesh:

Report time: 2023.09.16 17:54:10 UTC
Content file: 1 [Morrowind.esm]
RefNum: 9167
RefID: in_r_s_int_lentrance_01
Memory address: 000001ADEFC52C60
Cell: Ald-ruhn, Guild of Fighters
Coordinates: 256 -256 -512
Model: meshes\i\In_R_S_int_Lentrance_01.NIF
(DIR: D:\GOG Games\Morrowind\Data Files)

And some additional info from the questionnaire:

• Operating system: Windows 10 Home 22H2.
• Steps to reproduce: go to the location specified fresh out of the boat for clean installs of OpenMW and Morrowind.
• My expectations: looks closer to Morrowind, namely less difference between the floor and walls brightness.
• Logs: openmw.log
• Full settings: settings.cfg