I have a macbook pro connected to two external monitors. When 1Password X is invoked from a locked state on the main (laptop) display, password entry appears as expected: dots are seen as I type, concealing my password.
On an external monitor, however, dots are not seen--in fact, nothing is seen--as I type my password. However, once I press Enter, I'm logged in like usual.
1Password Version: Not Provided
Extension Version: 1.16.2
OS Version: 10.14.6
Sync Type: Not Provided