Sorry, no positive results, I've tried a lot of combination, switching civs, team, removing most project, but it alway's crash for UK (or any other civs I add on the map).
UK (and all other civs) can research projects without crashing on the 1939 and 1942 maps, but if I had a new civs on those, it crash too when trying to make that civ research the project.
I don't know if it's the WB that somehow corrupt the maps because of a hidden caps on the number of projects in the mod (like for the units), but the fact is that I've failed to fix it.
So for short term, I'll remove the 1936 map in the next version, but I'm now making top priority on something I was planning to do later.
Instead of loading the WB map, I'm going to use a mapscript to generate the maps from a table containing the data of the map, like in Seraphim's RealEarth mod. I hope to fix all WB related bugs this way.
And I'll make another script in a "lite" version of the mod to extract the data from the WB map to a table written in the Lua log.
That's something major, so no ETA, sorry.