The latest versions, either 8.6.9 or 8.6.10 would be best as they both support macOS dark mode as well. I personally build from source the 8.6.10 version. ActiveState adds even more bells and whistle's to this version.
macOS uses shims and symlinks to interface and change tcl/tk versions and tries to support their very very old 8.5 version and the more recent one side by side. My guess is the shims got broken resulting in a call into the weeds so to speak.
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