Strange bug in Fallout 1

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I'm playing a GOG version of Fallout 1 and am experiencing a strange bug. The problem occurs when I'm using a stimpack from a quick action menu, it is being used, but disappears from the menu, so I'm only able to use only one stimpack without accessing the inventory. Anyone knows how to fix this?
UPD: forgot to mention that my OS is MacOS High Sierra.
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How do I use the bug in Fallout 1?
To place the bug, simply use the Steal skill and drag the bug to Gizmo's inventory. The tape recorder can also be used to get the confession.How do you catch gizmo in Fallout?
Gizmo is located at the back of his casino. To obtain his confession, the player must either: Use steal to plant a bug on Gizmo (it's not necessary to talk to him then), Have the tape recorder in inventory, then talk to him.How do you talk to Gizmo?
Quick walkthrough Speak to Killian. Go to Gizmo's Casino. Plant a bug on Gizmo. Speak to Gizmo with a tape recorder equipped.How many bugs does Fallout 76 have?
The message states many of the "close to 1,000" bugs "were reported to us by the Fallout 76 community" and includes changes to auto-scrapping, V.A.T.S., a plethora of weapons, perks, quests, and much, much more.Fallout 1 Mysterious Stranger + talk + equipment
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