`IndexOutOfBoundsException` after pressing `link` in the context menu

[Niedermann IT-Dienstleistungen]

nextcloud-commons:1.6.2

Happened after pressing Link in the context menu:

App Version: 3.4.19
App Version Code: 3004019
App Flavor: fdroid

Files App Version Code: 30190190

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OS Version: 4.9.306-perf-g60bc22821300(10041563)
OS API Level: 30
Device: beryllium
Manufacturer: Xiaomi
Model (and Product): POCO F1 (beryllium)

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java.lang.IndexOutOfBoundsException: charAt: 72 >= length 72
	at android.text.SpannableStringBuilder.charAt(SpannableStringBuilder.java:124)
	at it.niedermann.android.markdown.MarkdownUtil.insertLink(MarkdownUtil.java:413)
	at it.niedermann.android.markdown.markwon.format.ContextBasedFormattingCallback.onActionItemClicked(ContextBasedFormattingCallback.java:67)
	at android.widget.Editor$TextActionModeCallback.onActionItemClicked(Editor.java:4357)
	at com.android.internal.policy.DecorView$ActionModeCallback2Wrapper.onActionItemClicked(DecorView.java:2660)
	at com.android.internal.view.FloatingActionMode$3.onMenuItemSelected(FloatingActionMode.java:97)
	at com.android.internal.view.menu.MenuBuilder.dispatchMenuItemSelected(MenuBuilder.java:787)
	at com.android.internal.view.menu.MenuItemImpl.invoke(MenuItemImpl.java:151)
	at com.android.internal.view.menu.MenuBuilder.performItemAction(MenuBuilder.java:934)
	at com.android.internal.view.menu.MenuBuilder.performItemAction(MenuBuilder.java:924)
	at com.android.internal.view.FloatingActionMode.lambda$setFloatingToolbar$0$FloatingActionMode(FloatingActionMode.java:122)
	at com.android.internal.view.-$$Lambda$FloatingActionMode$LU5MpPuKYDtwlFAuYhXYfzgLNLE.onMenuItemClick(Unknown Source:2)
	at com.android.internal.widget.FloatingToolbar$FloatingToolbarPopup$2.onClick(FloatingToolbar.java:442)
	at android.view.View.performClick(View.java:7448)
	at android.view.View.performClickInternal(View.java:7425)
	at android.view.View.access$3600(View.java:810)
	at android.view.View$PerformClick.run(View.java:28305)
	at android.os.Handler.handleCallback(Handler.java:938)
	at android.os.Handler.dispatchMessage(Handler.java:99)
	at android.os.Looper.loop(Looper.java:223)
	at android.app.ActivityThread.main(ActivityThread.java:7664)
	at java.lang.reflect.Method.invoke(Native Method)
	at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:592)
	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:947)