Review block generating double schema markup

[milicavs]

Description

The review block is generating the Product schema markup two times.

Step-by-step reproduction instructions

1. Go to https://validator.schema.org/
2. Enter any URL from the Themeisle blog that has the review block added (eg. https://themeisle.com/blog/wp-engine-review-for-wordpress/)
3. See how the Product item is detected twice

OR

1. Go to any URL from the Themeisle blog that has the review block added (e.g. https://themeisle.com/blog/wp-engine-review-for-wordpress/).
2. View the source of the page and look for the Product markup.
3. You'll see two script tags with the markup one right after the other.

Screenshots, screen recording, code snippet or Help Scout ticket

https://monosnap.com/file/W7ollK5t4wRhW5WIk1EgVJvYeOSp2d

Environment info

https://pastebin.com/yvZ1Q9yQ

Is the issue you are reporting a regression

No

[vytisbulkevicius]

I can't replicate this issue on a fresh website with Otter ratings and schema enabled. @Soare-Robert-Daniel, do you think it's an issue coming from Otter or some misconfiguration on themeisle.com blog? [I have limited admin rights on that website]

[Soare-Robert-Daniel]

@vytisbulkevicius, I'm not sure. Most of the issues reported on it involve missing schema, but I could not replicate the behaviour.

For the duplicates I think we can put some guards even if we can not reproduce it.

[ineagu]

@milicavs might be wp rocket here who is messing critical css? if this works well on a fresh instance?

[milicavs]

@ineagu Same issue appears when WP Rocket is disabled. Here's an example review from the test site where we don't have it: https://dmvatcfmnr.wpdns.site/rocket-net-review/