Jacob took the stone (ʼben) and “set it up as a pillar (massebah) and poured oil on the top of it” (Genesis 28:18). This standing stone was dedicated to Yahweh, therefore the use of a stone as a massebah was not forbidden.
Jacob's use of a stone as a massebah wasn't forbidden because it was dedicated to Yahweh.
There are several occasions where the massebah is not associated with pagan worship. When the massebah is associated with the worship of Yahweh, the massebah is accepted as a valid expression of commitment to Yahweh.
Massebah for pagan worship: - Exodus 23:24 (https://hypothes.is/a/r3m5QmyDEe6SC8eLYcJE1Q) - Hosea 10:1 (https://hypothes.is/a/4PK2GGyDEe6wZg_r2YpVCA ) - 2 Kings 18:4 - 2 Kings 23:14
Massebah for worship of Yahweh: - Genesis 28:18 Jacob's pillow (https://hypothes.is/a/NF5p8Gx6Ee65Rg_J4tfaMQ)<br /> - Genesis 31:44-45 Jacob and Laban's covenant - Exodus 24:4 - Joshua 24:25-27