Concentration check triggered when reverting hp.tempmax and the actor's hp.value is higher than hp.max

[thatlonelybugbear]

Split from #3363

• Creature gets a boon on tempmax and afterwards is healed above the normal hp.max.
• The tempmax boon reverts. The "hp loss" will trigger a concentration check, which is not considered actual damage and against RAW Concentration.

Maybe a change in actor.mjs:3307 would make sense?

async _onUpdate(data, options, userId) {
    super._onUpdate(data, options, userId);
    if ( userId === game.userId ) {
      await this.updateEncumbrance(options);
      this._onUpdateExhaustion(data, options);
    }

     const hp = options.dnd5e?.hp;
     if ( hp && !options.isRest && !options.isAdvancement ) {
        const curr = this.system.attributes.hp;
        const changes = {
        hp: curr.value - hp.value,
        temp: curr.temp - hp.temp,
      };
      changes.total = changes.hp + changes.temp;

      if ( Number.isInteger(changes.total) && (changes.total != 0) ) {
        this._displayTokenEffect(changes);
-     if ( !game.settings.get("dnd5e", "disableConcentration") && (userId === game.userId) && (changes.total < 0) ) {
+     if ( !game.settings.get("dnd5e", "disableConcentration") && (userId === game.userId) && (changes.total < 0) && (curr.value != curr.effectiveMax) ) {

          this.challengeConcentration({ dc: this.getConcentrationDC(-changes.total) });
        }
        //...