I noticed that when the MULTI SELECT flag is activated the placeholder works, when the flag is deactivated the placeholder stops working. Could you control this behavior?
I am not sure which customer/project you are working for/with (You do not need to disclose it here in a public forum). Even if I assume that in 9.2.3 I cannot really tell if this got fixed in 9.3.3 itself. Since this works now, and this is a minor issue, it may not be feasible to invest more time into its analysis. In the future updates/upgrades it may be made available to even on premises.