I have seen a claim in some English online encyclopedias claiming that LT vz. 38 was originally supposed to have a crew of 3 and only after it fell into hands of Nazis was it changed to 4. However, I failed to find any mention of that in Czech sources. Is this a mistake by confusing LT vz 38 for LT vz 35 or did I just not look well enough?
I saw the original claim at tanks encyclopedia
Also, the same claim was sort of repeated at Chieftain's video about tank types participating in battle of France, although there, it was rushed over and mentioned in one breath with LT vz 35.
As for where I've been searching for confirmation, I went to Czech wikipedia, some news articles and blogs of czech WW2 enthusiasts/amateur historians, but unlike with LT vz 35, nowhere did I find claim of crew of 3, only claim of crew of 4. I know that Germans later used it with 4 crewmen, but I can't find any reputable confirmation source confirming Czechoslovakia planned to only use 3.
Found a Czech bachelor thesis on LT vz. 35 and 38 (yeah, I know, very weak source, at best as good as that encyclopedia online) which claims exact opposite, that unlike LT vz. 35, LT vz. 38 was constructed with 4 members of crew in mind. It then, on the same page, describes original LT 38's internal communication module for commander and (three coloured lights), which proves it is talking about before Germans took over, because those did replace it with normal radio communication. Still it's just a bachelor thesis and thus, not too trustworthy source.