I've installed Backdrop on shared hosting through Softaculous - latest version of everything (apache php8.5.4) - and I'm having some issues with posting html content in text fields on all kinds of content, including blocks.

Basically the form submits, processes and then just resets with no error thrown and all the updated content not accepted.

If i try to change the text format to accept more html code, or even adding more buttons to the Basic text format (for example tables), once again nothing happens. No errors and no update.

I've tried a separate clean install from softaculous and the error persists.

I'm at a loss, so can anyone help, please?