I'm not sure if this is new to 20.1 but I'm just doing some test/fleshing out some code in 20.1 that involves some quite complex structs

one of the elements was called range an this produces strange behaviour so I assume it must be a reserved word in some way

Code:
Struct tdTest
    String dummy
    String range
    String ranger
End_Struct

tdTest t

This shows in the debugger as
dummy
SC013
ranger

If you try and move "A" to t.range you get an error