Speedreader icon disappears after toggling on/off a few times

Description

Speedreader icon disappears after toggling on/off a few times; found while testing https://github.com/brave/brave-browser/issues/18151

Steps to Reproduce

1. new profile
2. launch Brave
3. load https://brave.com/blog/
4. click on the reader-mode icon and click Turn on Speedreader
5. toggle Speedreader off
6. toggle Speedreader on

Actual result:

The Speedreader icon and mode disappear

(A shift + reload bring it back.)

Expected result:

Should still be an option to toggle Speedreader back on

Reproduces how often:

100%

Brave version (brave://version info)

Brave	1.32.5 Chromium: 94.0.4606.50 (Official Build) nightly (x86_64)
Revision	0c1ac2c4842a4746c27c937c1a0453f98da1a972-refs/branch-heads/4606@{#1049}
OS	macOS Version 11.6 (Build 20G165)

/cc @keur

[keur]

Thanks guys. I have some other stuff I have to wrap up, but will get to these ASAP.

[MadhaviSeelam]

Verified Passed using

Brave	1.38.78 Chromium: 100.0.4896.60 (Official Build) beta (64-bit)
Revision	6a5d10861ce8de5fce22564658033b43cb7de047-refs/branch-heads/4896@{#875}
OS	Windows 11 Version 21H2 (Build 22000.593)

• Fresh profile
• Launch Brave
• Load https://brave.com/blog/
• Click on the reader-mode icon and click Turn on Speedreader
• Toggle Speedreader on
• Toggle Speedreader off
• Verified turning on and off few times
• Verified Speedreader on/off toggle in the URL bar works expected and the icon do not disappear

ex1	ex2	ex3	ex4