<img>: alt="" turns into alt after recent dependencies update - is this an intended change?

Describe the bug I did yarn upgrade of mjml dependencies, and suddenly all <img alt="" src="..." /> turned into <img alt src="..." /> in the output. Is this an intended change? Will this shorthand alt attribute be valid for all email clients?

I run mjml with --config.keepComments=0 --config.validationLevel=strict --config.beautify=false arguments.

To Reproduce Steps to reproduce the behavior:

1. Create a file with this MJML code: <mjml><mj-body><mj-text><img alt="" src="..." /></mj-text></mj-body></mjml>
2. Render it to HTML by doing 'mjml --config.keepComments=0 --config.validationLevel=strict --config.beautify=false`

MJML environment (please complete the following information):

• OS: MacOS
• MJML Version: 4.5.1
• MJML tool used: mjml cli