Effect Flanger (linear), nyquist plugin.

The effect distorts the end of the file. Uncomfortable to use, can’t be included to the chain. Please correct! Before applying (1), after applying (2). That is, the right channel, although not much longer, becomes shorter than the left channel.
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Most Nyquist plug-ins are released under the terms of GPL v2: GNU General Public License v2.0 - GNU Project - Free Software Foundation
I refer you to section 11.

Followed to link, no section 11 see.
In general, how many effects are applied - for the first time I see that the plug-in made the channels not equal. Or just do not pay attention?
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There is …

  1. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY FOR THE PROGRAM

There are other flanger plugins, e.g … Flanger