Hey, so as I reported on youtube (septnaz23) I faced few issues with the mount plugin.
The first one beeing that once mounted, my classic "on player contact" events are not triggering on mount walking on the tile / passing the tile, I've tested all the possibilities on the priority just not dived into more complexe region detection.
The second one, it's about the z-index, I got some roofs that are printed above the player, on multiple layers using a simple plugin that allows the star configuration tiles to avoid cutting the player head, Cyclone tile priority. When the player is rendered under the mount, both are going under my tile roofs, but if the player is rendered above the mount, then both the mount and the player goes above the star tiles. The said roof is like a gallery / arcade roof sergment (arround a building).
Third one, when walking on a bush type tile, the mount bottom doesn't turn semi-transparent, I assume because it's not a "player" but an "event" so it's logic. On this one I would suggest to add a tag that allow to swap the thing, changing the player sprite to the mount sprite and put an event with the motion over it with player graphic transfered to the event. Idk how complexe it would be compared to reproduce player logic on the event directly.
Then a small suggestion but may be complexe, about hitbox. It would be very usefull to be able to set the left/right/down/up hitbox size (in tiles x/y) with comment tags.
Final suggestion: amphibious tag, mounts that would be able to go on water only, like surfing in oldschoolo pokemon games.