Hi @kazurayam,
This is a known bug of the Eclipse-based framework on macOS Big Sur: 565969 – [Big Sur] Table selection drawn over text/checkbox when SWT.EraseItem is hooked (Git History: Can't Read Any Text Except "Committed Date" on Selected Commits). This bug is already fixed in Eclipse v4.18M3 (not released yet). We are finding a way to merge the fix in our code but it is a challenge for now.
Our devs are also working on the bellowed issues and will release the fix soon:
References for Eclipse known bugs and fixed PR on macOS Big Sur: