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I have expression:

Abs[Hypergeometric1F1[-n, m + 1, x]]^2 // TeXForm

Give me error during editing this question (Missing or unrecognized delimiter for \left) if i put here:

$\left\left| \, _1F_1(-n;m+1;x)\right\right| {}^2$

If I convert back:

ToExpression["$\left\left| \, _1F_1(-n;m+1;x)\right\right| {}^2$", \TeXForm]

MMA again give me error:(Error: expected)

What could be the reason?.Thank you.

$Version
(*  "11.2.0 for Microsoft Windows (64-bit) (September 11, 2017)" *)
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