A twitter post doesn't show in FFox's incognitor mode only

[Bathinda (Bathinda Helper)]

I, as an admin, embedded a twitter post, that contains a small video, into a post on my own site.

Now that video shows correctly when seen from Firefox’s normal browsing mode (even a user can see that post).
But same post when seen in FF’s incognito mode (whether by a user or admin), it shows below given (mime format) error:

Firefox is latest version as of date on Windows11

[Falco]

You see the blue shield on the location bar? That what’s blocking the embed.

If the user wants embeds, it’s necessary to disable the protection on the domain.