In the beginning the Baha'i faith permitted converts to maintain participation in their birth religion and thus not fully break with their communities.

...as pressures to convert to Islam diminished, and some economic success was achieved, the Zoroastrian community faced more challenges. One was the rise of Bahaism. Bahaism, founded in mid‑nineteenth‑century Iran, promoted equality, repudiated the concept of non‑Muslims as polluting, and permitted converts to maintain participation in their birth religion and thus not fully break with their communities. There were intra‑marrying Zoroastrian Baha’is, Jewish Baha’is, and Muslim Baha’is (Kestenberg Amighi 2022: 142). However, conversions to the Baha’i religion reduced the small Zoroastrian population by some 4,000 people (Maneck 1991: 1) and caused fierce rifts between Zoroastrian traditionalists who saw the Baha’is as a threat, and reform‑minded Zoroastrians and Parsis who believed that the Baha’is were laying a foundation for the liberalisation of Iran. The conflict grew so intense that, in 1915, a pro‑Baha’i Zoroastrian in Yazd, educator Master Khodabakhsh, was murdered (Kestenberg Amighi 1990: 166), and like‑minded Ostad (‘teacher’) Keyomarz was warned to flee Iran (Fischer 1973: 108 fn1). According to one theory, it was the conservative Zoroastrian organisation, Yazd Right Followers, which was responsible for the murder and threats (Dadbakhsh and Moftakhri 2018: 4–5).

(ZOROASTRIAN POLITICS IN THE ERA OF THE CONSTITUTIONAL REVOLUTION IN IRAN
(1905–1911) by Janet Kestenberg Amighi)