[BUG] Markers don't show up within a loop + memory leak (from v2.0)

[moehmeni]

Expected Behavior

Hi, I wanted to show multiple markers within a loop but it makes the screen black as soon as the window reaches the marker point. From earlier versoin (1.0.18) it doesn't have this problem
see also #461

Current Behaviour

makes the screen black as soon as the window reaches the marker point also prints that it has memory leak

debug logs:

[pywebview] Using Cocoa
DEBUG:pywebview:Using Cocoa
Bottle v0.13.1 server starting up (using ThreadedAdapter())...
Listening on http://127.0.0.1:54362/
Hit Ctrl-C to quit.

127.0.0.1 - - [28/Nov/2024 23:40:52] "GET /test.html HTTP/1.1" 200 610
127.0.0.1 - - [28/Nov/2024 23:40:52] "GET /styles.css HTTP/1.1" 200 4391
127.0.0.1 - - [28/Nov/2024 23:40:52] "GET /bundle.js HTTP/1.1" 200 48186
127.0.0.1 - - [28/Nov/2024 23:40:52] "GET /lightweight-charts.js HTTP/1.1" 200 160942
/Library/Developer/CommandLineTools/Library/Frameworks/Python3.framework/Versions/3.9/lib/python3.9/multiprocessing/resource_tracker.py:216: UserWarning: resource_tracker: There appear to be 14 leaked semaphore objects to clean up at shutdown
  warnings.warn('resource_tracker: There appear to be %d '

Reproducible Example

This works:

chart.marker(s.orders_history[-1].entry_time, text="Entry", color="blue")

but this does not which is exactly the same:

    for o in s.orders_history[-1:]:
        chart.marker(time=o.entry_time, text=o.enter_reason, color="blue")

Environment

- OS: mac 14.7
- Library: 2 and 2.1