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PHP 7.3 reaches end of support in December 2021 and Adobe Commerce 2.3.x reaches end of support in April 2022. You may want to consider planning your upgrade now to Adobe Commerce 2.4.x and PHP 7.4.x to help maintain PCI compliance.

Tinymce3

We have updated the TinyMCE module to the latest available version, 4.6.4. TinyMCE v4.6.4 provides backwards-compatibility for modified editor modules to prevent the loss of functionality. The TinyMCE3 module is now deprecated and will be removed in a future release.