Form view shows wrong image attachments when scrolling through features

[generic-user-name-1]

Describe the bug

When scrolling through features in form view sometimes it shows the wrong image attachments if there is no entry in the column instead of no image. I have attached a project where you can reproduce the problem.
How to Reproduce

1. Open the attached project
2. Open attribute table of point layer
3. Switch to form view
4. Click several times on "navigate to next feature" or previous feature

sample project.zip

2021.04.07-17.54.mp4

QGIS and OS versions

QGIS Version 3.16.5, new profile, no plugins installed, tested both on Windows 10 and Mac.

QGIS version	3.16.5-Hannover	QGIS code revision	58ba7c1
Compiled against Qt	5.11.2	Running against Qt	5.11.2
Compiled against GDAL/OGR	3.1.4	Running against GDAL/OGR	3.1.4
Compiled against GEOS	3.8.1-CAPI-1.13.3	Running against GEOS	3.8.1-CAPI-1.13.3
Compiled against SQLite	3.29.0	Running against SQLite	3.29.0
PostgreSQL Client Version	11.5	SpatiaLite Version	4.3.0
QWT Version	6.1.3	QScintilla2 Version	2.10.8
Compiled against PROJ	6.3.2	Running against PROJ	Rel. 6.3.2, May 1st, 2020
OS Version	Windows 10 (10.0)
Active python plugins	db_manager; MetaSearch; processing

Additional context

[troopa81]

Fixed by #43144