In my testing it seems that this function runs not only when you pick up an EXP orb, but also when you fail to pick up an exp orb.

In minecraft you can only pick up 1 exp orb every 2 ticks. This function seems to be called not only when the orb is collected, but when the orb FAILS to collect (due to the rate limit)

if a player stands around a pool of experience, this will lead the oldest particles to exponentially grow. this can cause players to gain 100s of levels of experience VERY quickly.

Example video of issue: https://drive.google.com/file/d/1MC1IUltJ5x3mT32hwG5_8ezVGW8F5ILq/view?usp=sharing

This also affects https://github.com/Majrusz/MajruszsAccessories/blob/45a39cb436d3db1b7ef37b1156b64908378ef5a1/common/src/main/java/com/majruszsaccessories/boosters/components/ExperienceBonus.java#L9

My recommendation would be either to change the name of the helper to OnExpOrbTouched, or In your library check to make sure the experiencePickUpDelay is 0

Hello, OnExperiencePickedUp is called only when the delay is equal to 0 https://github.com/Majrusz/MajruszLibrary/blob/1.20.X/common/src/main/java/com/mlib/mixin/MixinExperienceOrb.java#L25. The inject is before take method:

    public void playerTouch(Player $$0) {
        if (!this.level().isClientSide) {
            if ($$0.takeXpDelay == 0) {
                $$0.takeXpDelay = 2;
                // <-- code was injected here
                $$0.take(this, 1);
                int $$1 = this.repairPlayerItems($$0, this.value);
                if ($$1 > 0) {
                    $$0.giveExperiencePoints($$1);
                }

                --this.count;
                if (this.count == 0) {
                    this.discard();
                }
            }
        }
    }

However you are right, there was a bug that exponentially increased the experience that I fixed here Majrusz/MajruszLibrary@cad9a82. Anyway, thanks for the report!

apologies for the mistake! Hope i didnt lead you down too much of a rabbit hole. Thanks for the patch!