same thing happened to me as well, well disappeared after catching 3 fishes

bump

Even though I have posted my thoughts previously... I came up with another solution to this.

When fishing in a Well, it can NOT go poof or be destroyed since there are no monsters being spawned when fishing ... wait for it... if & when a Monster is fished from the Well... then it should go poof or be destroyed. SO ... like in the past when fishing in a Well... you had a chance to fish up a Monster from that Well.

Basically just re-introduce this again, also increase the chance of monsters fished up in a Well... this way it makes it more entertaining.