I could not find in history what could be a regression.
There is a check for the click in toggleFromButton:
But not for the touch:
https://github.com/discourse/discourse-reactions/blob/main/assets/javascripts/discourse/widgets/discourse-reactions-actions.js#L170-L183
I guess you could do the following not to open the reactions list:
touchStart() {
cancel(this._touchTimeout);
if (this.capabilities.touch) {
if (
this.attrs.post.current_user_reaction &&
!this.attrs.post.current_user_reaction.can_undo
) {
return false;
}
...
}