Inventory not working ok with add-ons

[Valentina R]

Can be reproduced here for the 11.02.2020.

The product inventory is set to 64.

• On the 11.02.2020 at 11:59, 5 slots are booked, leaving 59 slots left. OK.
• On the 11.02.2020 at 15:59, 7 slots are booked, leaving 57 slots left. OK.
• But if you select the ‘full day’ add-on checkbox which adds 180 minutes, it shows 52 slots left. WRONG. It should be 57 slots left instead.

Reported here.

[Željan Topić]

Cannot reproduce any more, presumed as fixed.