When I display or hide a column with the hidden attribute, then the column span don't update in the expanded row. Basically the expanded row doesn't follow the simple row's col spans.

That would be awesome to have this repaired.
I'm having the same issue. It seems visibleColumnSize() is being called and calculated properly but the prop visibleColumnSize remains the same.
We will fix this in this weekend, sorry for inconvenience.
Fixed in newest version, please upgrade all the related packages listed in below notes:
https://react-bootstrap-table.github.io/react-bootstrap-table2/blog/2019/03/10/version-bump.html

after update all packages today the bug is still there. My fault? Or is it back?
thanks for help.
I am still facing same problem. i am using following
"react-bootstrap-table-next": "^3.2.1",
"react-bootstrap-table2-paginator": "^2.1.0",
"react-bootstrap-table2-toolkit": "^2.1.0",
I have also tried following combination but bug still persists
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Most helpful comment
We will fix this in this weekend, sorry for inconvenience.