My guess:
Since Debian Stable is still on XFCE 4.12, it's likely whisker 2.3+ could be the Debian Stable Buster repo's gtk2 whisker version for 4.12.
MX19's own default repo currently has the unreverted 2.5.3-1 (which is actually for xfce 4.16)
MX19's Test repo will now have the 2.5.3-1really2.4.6~mx19+1 (which is the proper one that works with xfce 4.14)
The Log-out icon is wrong after Whisker Menu update
Re: The Log-out icon is wrong after Whisker Menu update
Desktop: Intel i5-4460, 16GB RAM, Intel integrated graphics
Clevo N130WU-based Ultrabook: Intel i7-8550U (Kaby Lake R), 16GB RAM, Intel integrated graphics (UEFI)
ASUS X42D laptop: AMD Phenom II, 6GB RAM, Mobility Radeon HD 5400
Clevo N130WU-based Ultrabook: Intel i7-8550U (Kaby Lake R), 16GB RAM, Intel integrated graphics (UEFI)
ASUS X42D laptop: AMD Phenom II, 6GB RAM, Mobility Radeon HD 5400