I’m not sure whether the cause of the following is a bug or a setting.
Given a document with two text files, two jsee files and two tsv files (tab separated):

Switch from
doc1.txt → table1.tsv ✓ Cell toolbar shown
table1.tsv → doc1.txt ✓ Cell toolbar hidden
doc1.txt → jsee1.jsee ✓ Cell toolbar hidden
jsee1.jsee → table1.tsv ✗ Cell toolbar hidden ???
table1.tsv → table2.tsv ✓ Cell toolbar shown
table2.tsv → jsee1.jsee ✗ Cell toolbar shown ???
I.e. switching between tab separated and jsee files leaves the cell toolbar’s visibility at its previous state.