Use of tag characters in a private encoding - is it valid please?

[Erik Carvalhal Miller]

The tag characters being default ignorable, I would expect a single
missing‐glyph glyph (representing the private‐use code point) to be more
likely, though your mileage may vary.   Here, for example, is a sequence
containing 15 tag characters between a private‐use base and the CANCEL TAG:
⟨􏿽󠁔󠁨󠁩󠁳󠀠󠁩󠁳󠀠󠁡󠀠󠁴󠁥󠁳󠁴󠀮󠁿⟩

On Friday, April 26, 2024, Ken Whistler via Unicode <
unicode at corp.unicode.org> wrote:

> Just do not expect to be able to interchange your intent reliably, unless
> you get widespread public agreement about your use both of the PUA
> characters and your conventions for use of the tag characters. Otherwise,
> it is likely the person you communicate with will just see:
> *□□□□□□□□□□□□□□□*
>
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