[eventcalendar] Queries generate behavioural and display defects

[Megajoul]

Setup

• MW version: 1.37.2
• DB (MySQL etc.): 10.1.48-MariaDB
• PHP version: 7.4.27
• SMW version: 4.0.1
• SRF version: 4.0.1
• Browsers and versions (if applicable): Firefox 99.0 (64 bits)

Issue

Queries with eventcalendar format:

• force the user to click on "pane view" to see the result (even if the option to enable the pane view is selected in the user options)
• display curious labels
• clicking on the Refresh button displays a spinning icon indefinitely.

Steps to reproduce

{{#ask:[[Category:Objects]]
|?=title
|?Creation date
|?Modification date
|format=eventcalendar
|firstday=Monday
|theme=vector
}}

Observed result:
The user must click on the pane view button to see the results (you even have to click twice on the button to see the results when the page is first displayed):

→

Defects in labels:

Clicking on the Refresh button:

forces you to wait until the end of time?

[kghbln]

Thanks for reporting. This is really bad indeed.