fix(app): fix thumbnail generation issue

[kevin-devstack]

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Current status: executed

| Reviewer | Score | |--------|--------| | @race-of-sloths | 1 | Your contribution is much appreciated with a final score of 1! You have received 10 Sloth points for this contribution

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@cherrybarry, please score the PR with @race-of-sloths score [1/2/3/5/8/13]. The contributor deserves it. If no scoring is provided within 24 hours, this PR will be scored as 1 🦥