When clicking "Add Server" in the Multiplayer menu followed by the black dialog box under "Server Address", the client returns to the Multiplayer menu.
This last action of clicking the box does not make the clicking sound.
I attached a video of the full boot-up sequence, navigation and bug showcase to provide any possible information from during bootup. The console has no additional logged errors.
Linked issues
duplicates 1
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Already fixed in 1.15-pre3, see MC-166411.
I found out this bug is a duplicate of others issues citing "Unable to add servers" or alike. I could not find these issues when I searched with the terms I worded it here. My apologies for this.