Zero-Width Joiner U+200D

[Andreas Prilop]

I think that

    U+FECC
    medial ain
and
    U+200D U+0639 U+200D
    ZWJ, ain, ZWJ

should look the same, regardless of surrounding text and direction.
Is this correct?
Some programs (such as Firefox) display them differently;
see the attached HTML file.
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