I can confirm the issue too. I flashed an image, stopped E2 and started in console mode. Using GUI, I installed the OWIF terminal, as reported it stalled. I did a ctrl & C to stop E2 then restarted. Everythng back to normal including shellinabox within OWIF.
I have given Spacerat a ping on Slack.
< 281.1449> 20:27:14.6880 [eRCDeviceInputDev] emit: 1
< 281.1465> 20:27:14.6896 [InfoBarGenerics] Key: 352 (Make) KeyID='KEY_OK' Binding='('OK',)'.
< 281.1471> 20:27:14.6901 [ActionMap] Keymap 'WizardActions' -> Action = 'ok'.
< 281.1522> 20:27:14.6952 [Skin] Processing screen 'MessageBox', position=(380, 355), size=(520 x 10) for module 'MessageBox'.
< 281.1707> 20:27:14.7138 [ePNG] loadSVG /usr/share/enigma2/skin_default/icons/input_error.svg 53x53 from 53x53
< 281.1772> 20:27:14.7202 [ePNG] loadSVG /usr/share/enigma2/skin_default/icons/input_info.svg 53x53 from 53x53
< 281.1816> 20:27:14.7246 [ePNG] loadSVG /usr/share/enigma2/skin_default/icons/input_question.svg 53x53 from 53x53
< 281.1856> 20:27:14.7287 [Screen] Warning: Skin is missing element 'icon' in <class 'Screens.MessageBox.MessageBox'>(Do you really want to download the plugin "extensions-openwebif-terminal"?).
< 281.1861> 20:27:14.7292 [Pixmap] setPixmapNum(0) failed! defined pixmaps: []
< 281.1987> 20:27:14.7417 [Skin] Processing screen 'MessageBox_summary' from list 'MessageBoxSummary, ScreenSummary, MessageBox_summary, SimpleSummary', position=(0, 0), size=(720 x 576) for module 'ScreenSummary'.
< 281.2067> 20:27:14.7497 [Screen] Showing screen '['MessageBoxSummary', 'ScreenSummary', 'MessageBox_summary', 'SimpleSummary']'.
< 281.2119> 20:27:14.7549 [Screen] Showing screen '['MessageBox']'.
< 281.3091> 20:27:14.8522 [eInputDeviceInit] 0 160 (352) 1
< 281.3092> 20:27:14.8522 [eRCDeviceInputDev] emit: 0
< 281.3106> 20:27:14.8537 [InfoBarGenerics] Key: 352 (Break) KeyID='KEY_OK' Binding='('OK',)'.
< 283.4416> 20:27:16.9846 [eInputDeviceInit] 1 160 (352) 1
< 283.4417> 20:27:16.9847 [eRCDeviceInputDev] emit: 1
< 283.4433> 20:27:16.9863 [InfoBarGenerics] Key: 352 (Make) KeyID='KEY_OK' Binding='('OK',)'.
< 283.4438> 20:27:16.9868 [ActionMap] Keymap 'MsgBoxActions' -> Action = 'ok'.
< 283.4468> 20:27:16.9899 [Screen] Showing screen '['PluginDownloadBrowserSummary', 'ScreenSummary', 'PluginDownloadBrowser_summary', 'SimpleSummary']'.
< 283.4547> 20:27:16.9978 [Screen] Showing screen '['PluginDownloadBrowser']'.
< 283.4595> 20:27:17.0026 [Skin] Processing screen 'Console', position=(200, 120), size=(880 x 480) for module 'Console'.
< 283.4694> 20:27:17.0124 [Console] executing in run 0 the command: /usr/bin/opkg install enigma2-plugin-extensions-openwebif-terminal
< 283.4695> 20:27:17.0125 [eConsoleAppContainer] Starting /bin/sh
< 283.4729> 20:27:17.0160 [Skin] Processing screen 'SimpleSummary' from list 'ConsoleSummary, ScreenSummary, Console_summary, SimpleSummary', position=(0, 0), size=(720 x 576) for module 'ScreenSummary'.
< 283.4814> 20:27:17.0244 [Screen] Showing screen '['ConsoleSummary', 'ScreenSummary', 'Console_summary', 'SimpleSummary']'.
< 283.4897> 20:27:17.0327 [Screen] Showing screen 'Console'.
< 283.6061> 20:27:17.1491 [eInputDeviceInit] 0 160 (352) 1
< 283.6062> 20:27:17.1492 [eRCDeviceInputDev] emit: 0
< 283.6078> 20:27:17.1509 [InfoBarGenerics] Key: 352 (Break) KeyID='KEY_OK' Binding='('OK',)'.
< 379.8339> 20:28:53.3770 [eConsoleAppContainer] Starting /usr/bin/grab
< 418.9514> 20:29:32.4944 [AutoTimer] current auto poll 2021-09-06 20:29:32
< 418.9520> 20:29:32.4951 [AutoTimer] Auto Poll Started
< 418.9605> 20:29:32.5035 [Task] job Components.Task.Job name=AutoTimer #tasks=0 completed with [] in None
< 418.9624> 20:29:32.5054 [AutoTimer] next auto poll at 2021-09-06 20:59:32