TONES + TONES_EXTRA is being applied to most, if not all, radios.
A changes made back in 2013 and 2016 updated chirp_common.py by changing rtone and ctone in the _valid_map from TONE to TONE + TONES_EXTRA. This apparently caused no ill effects over the years when programming radios using the classic CHIRP.
Recently it was noticed that many, if not all, radios programmed with CHIRP-next have a list of 10 additional CTCSS tones appended to the drop down list of tones that in most cases are not supported by the radio being programmed. There are currently only 2 radios that are intended to use the additional TONES_EXTRA tones: AnyTone 5888UV and Leixen VV898. The rtone and ctone in _valid_map should be reverted back to TONES only and the 'extra' tones should be moved to the specific drivers that will actually use them.