I have a grid with posts that I'd like to place grids inside of. Last time I attempted this, it locked the site up from infinite loops. Is there any way of doing this now or of this getting resolved in the near future so that I can use it in this way?
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Yes, you can, but you need to exclude current post where the post grid shortcode you are displaying, Please see the options
Query Post > Exclude by post ID
Otherwise it will create infinite loop,