HTML code appears within attachment during drag&drop

Operating system

Windows

Joplin version

3.3.13

Desktop version info

Joplin 3.3.13 (prod, win32)

Device: win32, Intel(R) Core(TM) i7-8565U CPU @ 1.80GHz
Sync Version: 3
Profile Version: 47
Keychain Supported: Yes
Alternative instance ID: -

Revision: 144ed59

Backup: 1.4.3
Favorites: 1.3.2
Freehand Drawing: 3.0.1
Note Tabs: 1.4.0

What issue do you have?

Hi,

when dragging and dropping HTML files on a note, sometimes HTML code from file contents gets inbetween (with purple background).
When I drag multiple files at once, it look like this happens just for one file in the batch.

Please see attached screenshot "A".
Then I have to press the "DEL" key and everything works as you may see on screenshot "B".

I am not sure, is this a bug?

Screenshots