Thanks. This is really useful.l!
Hi, thanks for the message here. We didn't know about this custom and would be happy to make the change for future years. Can you share your source? If it's a printed luach I would love to see a photo if you are willing to share.
I did find a reference on the Wikipedia page for Parashat Maasei, which suggests adding only 2 verses from Isaiah.
This is the Luah Hashanah by Rabbi Miles B. Cohen and Leslie Rubin. Other sources can be found by Googling "haftarah shabbat rosh chodesh av," including a 6 minute d'var halacha discussing the issue in detail in the audio clip here: https://www.yutorah.org/lectures/lecture.cfm/1005909/rabbi-daniel-roselaar/daily-halachah-haftarah-for-shabbat-rosh-chodesh-av/
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