Internal page space from right.

I have verified the patch #2 and tested it on Drupal version 9.5.x. The patch works fine and I have added the before and after screenshots for reference.
NOTE: The css class what you have targeted will apply only for the image in 'Basic Page' content type alone. I think we need to target specific classes for other content types as well.

Example:

For article content type,

.block-system-main-block .node--type-article .field--name-body p img.align-left {
margin-right: 15px;
}

I hope the following will work for all content type

.block-system-main-block article p img.align-left {
margin-right: 15px;
}