Failure when running image transforms on animated GIFs

Description

Hi there! We are having persistent issues when running image transforms on animated GIF files. These transforms all attempt to resize the images.

The issues we've seen most often are:
A) the resize operation fails to complete at all
B) the resize operation completes, but the resulting image is "broken" -> the animation has severe artifacts

Our stack is running on Heroku. What we see in the logs is often:

Jul 16 10:51:42 appname app/web.1 [16-Jul-2021 17:51:42] WARNING: [pool www] child 180, script '/app/web/index.php' (request: "GET /index.php?p=actions/assets/generate-transform&transformId=213") execution timed out (49.358224 sec), terminating

We've been able to confirm that we can resize the animated GIFs using ImageMagick command-line tools with no artifacts present and without any delays using this command:

$ convert input.gif  -resize 800x800 -layers OptimizeFrame output.gif

Steps to reproduce

1. Upload the attached GIF file
2. Associate it with some article in such a way that the image transforms are requested when viewing the article
3. View the article and observe you don't see the image; access your system logs and observe warnings or errors

Additional info

• Craft version: Craft Pro 3.6.17
• Image driver: Imagick 3.5.0 (ImageMagick 6.9.10-23)
• PHP version: 7.4.21 running on Linux 4.4.0-1093-aws in Heroku
• Database driver & version: PostgreSQL 9.5+
• Plugins & versions:

Amazon S3 		1.2.11
Control Panel CSS 	2.3.0
Feed Me 		4.3.6
Neo 			2.10.7
Redactor 		2.8.7
Sentry SDK 		1.1.2
SEOmatic 		3.3.44
Sprig 			1.7.0
Super Table 		2.6.8
Tags 			1.0.7
Twigpack 		1.2.15
Typed link field 	1.0.25

We've noticed similar issues that are now closed such as this one.

Please let me know if I can supply any additional information to clarify the issue. Thanks.