Biraghi Den alarm system is not working properly

Bug Name:

Biraghi Den alarm system is not working properly​

Bug Description:

It used to be a retail bug, so I personally didn’t care
But then retail has repaired it
Our alarm system will no longer be upgraded after the first stage (up to five stages), so the boss can’t summon.​

How to reproduce/proof:

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emmm...no?
I know that the retail has changed the alarm system at the end of September (our version has not arrived yet, I know, but in fact it is only changing the alarm system from hunting grounds to individuals systems, there is no change in the stage).

Frankly speaking, I didn't test it strictly(only 2 hours farm, the alarm system reached stage 1, and then only the beam of light was left, and the alarm system no longer responded.).
This post will write that the alarm system cannot be upgraded because, according to PA, the boss will be summoned after the alarm reaches stage 5(I can't be sure if it really is like this.).

More simply, our boss cannot be summoned.
Retail fixed this on April 21.

Then April 27th (Retail fixed it on April 21, but the uploaded video is April 27th).
0:56 start

retail can be summoned boss (Prior to this, retail was also broken).