From time-to-time unfamiliar figures can appear in figured bass. Most of the time they occur because of decorative notes which are essential to include. Sometimes the figure will include a dash, but this does not necessarily mean it is a suspension, It can instead point to the voice-leading (both notes should be put into the same part).
In this example (Caldara Trio Sonata Op.1/9) the figure 8-7 appears. This is an instruction to move from the octave into the 7th as a passing note.
In this bar (Reincken, Sonata no.4) we find 5-6. This is an instruction to move from the 5th to the 6th in the same part. The effect is a root position chord sliding quickly into a first inversion: