I can't find information about right pronunciation of patchim ㄷ(ㅅ, ㅆ, ㅈ, ㅉ, ㅌ, ㅊ) before ㄱ. From what I can hear ㄷ should be silent. But I am not sure about it.
For example in words like 웃겨 I hear 우껴 and not 욷껴. Similarly 맛있게 for me sounds like 맛이께 and not 맛읻께. The same with 맛있겠다 which sounds like 맛이껟따.
From comments from OP: sampleSample audio clips:
For 맛있겠다 https://forvo.com/word/%EB%A7%9B%EC%9E%88%EA%B2%A0%EB%8B%A4/#ko
For 맛있게 https://forvo.com/word/%EB%A7%9B%EC%9E%88%EA%B2%8C/#ko