Completion not displayed for members after shown once

Very simple to reproduce, the completion is not working fine when you're typing the name of a variable, then the completion is shown, but when you want to access on it from "->" or "." while the completion popup is still on screen, the completion disappear. By removing the access char and retyping it it's fine but this is annoying for coding.

This bug isn't there on version 4.11.1.

Here the link of the gif since the upload of attachments is not working at all: https://gyazo.com/ee9b5f5a8ffaba27a1530fe716e7442e