Vendor Lock (one character per merchant)

[Castle2.0]

I remember not being able to use vendors when another character was using them, similar to how TS containers are.

Was this alpha and never made it to classic, or just not mentioned in patch notes? Cannot find any mention in patch notes.

Asking because (1) I remember it classic (but could be misremembering) and (2) recent case of item theft while recharging brought it to mind.

Thankfully, I haven't been ganked by these underhanded con artists, but the threat is real yo.

Anyone remember this or find any post, patch note, etc. in regards to this?